Added: Using the Fabric mod "HavenBagsPreview", you can view the bag's content is a small GUI in the tooltip, when hovering over the bag.
https://modrinth.com/mod/havenbagspreview
Special thanks to ArturoAtomCode/ArturoAtomplay for the mod!
Added: Config value in plugins.yml for the mod HavenBagsPreview.
Code (YAML):
mods:
HavenBagPreview:
enabled
: true
You can disable this if you don't want it on your server, or if the NBT data becomes too large.
Fixed: blacklist.yml and plugins.yml weren't correctly validating.